public void BuildGreaterThanExpression( )
{
//Arrange
List <Person> people = FakeData.People();
Expression <Func <Person, bool> > express = PredicateBuilder.BuildGreaterThan <Person>("Age", 40);
Func <Person, bool> func = express.Compile();
var result = people.Where(func);
var expectedResult = people.Where(p => p.Age >= 40);
Assert.That(result, Is.EquivalentTo(expectedResult));
}